Fix typo in Windows elasticsearch-env script

This commit fixes a simple typo in the Windows version of the
elasticsearch-env script; this typo is harmless as it appears in a
comment.

distribution/src/main/resources/bin/elasticsearch-env.bat

@@ -1,6 +1,6 @@
 set SCRIPT=%0
 
-rem determine Elasticsearch home; to do this, we strip from the path util we
+rem determine Elasticsearch home; to do this, we strip from the path until we
 rem find bin, and then strip bin (there is an assumption here that there is no
 rem nested directory under bin also named bin)
 for %%I in (%SCRIPT%) do set ES_HOME=%%~dpI